java.lang.AssertionError
   at com.sun.tools.javac.util.Assert.error(Assert.java:155)
   at com.sun.tools.javac.util.Assert.checkNonNull(Assert.java:62)
   at com.sun.tools.javac.comp.Annotate.queueScanTreeAndTypeAnnotate(Annotate.java:984)
   at com.sun.tools.javac.comp.Attr.visitVarDef(Attr.java:1146)
   at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:956)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:510)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:651)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:721)
   at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:745)
   at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1232)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1020)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:510)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:651)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:721)
   at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:745)
   at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1232)
   at org.netbeans.lib.nbjavac.services.NBAttr.visitBlock(NBAttr.java:82)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1020)
   at com.sun.tools.javac.comp.ArgumentAttr.visitTree(ArgumentAttr.java:203)
   at com.sun.tools.javac.tree.JCTree$Visitor.visitBlock(JCTree.java:3065)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1020)
   at com.sun.tools.javac.comp.ArgumentAttr.attribArg(ArgumentAttr.java:193)
   at com.sun.tools.javac.comp.Attr$MethodAttrInfo.attr(Attr.java:558)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:651)
   at com.sun.tools.javac.comp.DeferredAttr.attribSpeculative(DeferredAttr.java:496)
   at com.sun.tools.javac.comp.DeferredAttr.attribSpeculative(DeferredAttr.java:477)
   at com.sun.tools.javac.comp.DeferredAttr.attribSpeculativeLambda(DeferredAttr.java:452)
   at com.sun.tools.javac.comp.ArgumentAttr.lambda$visitLambda$110(ArgumentAttr.java:296)
   at com.sun.tools.javac.comp.ArgumentAttr.processArg(ArgumentAttr.java:243)
   at com.sun.tools.javac.comp.ArgumentAttr.visitLambda(ArgumentAttr.java:294)
   at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1807)
   at com.sun.tools.javac.comp.ArgumentAttr.attribArg(ArgumentAttr.java:193)
   at com.sun.tools.javac.comp.Attr$MethodAttrInfo.attr(Attr.java:558)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:651)
   at com.sun.tools.javac.comp.Attr.attribArgs(Attr.java:754)
   at com.sun.tools.javac.comp.Attr.visitNewClass(Attr.java:2143)
   at com.sun.tools.javac.tree.JCTree$JCNewClass.accept(JCTree.java:1689)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:510)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:651)
   at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:690)
   at com.sun.tools.javac.comp.Attr.visitVarDef(Attr.java:1184)
   at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:956)
   at com.sun.tools.javac.comp.Attr$ResultInfo.attr(Attr.java:510)
   at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:651)
   at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:721)
   at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4802)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4686)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4614)
   at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4559)
   at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1409)
   at com.sun.tools.javac.api.JavacTaskImpl$1.process(JavacTaskImpl.java:498)
   at com.sun.tools.javac.api.JavacTaskImpl$Filter.run(JavacTaskImpl.java:639)
   at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:501)
   at org.netbeans.modules.java.source.indexing.OnePassCompileWorker.compile(OnePassCompileWorker.java:272)
   at org.netbeans.modules.java.source.indexing.JavaCustomIndexer.index(JavaCustomIndexer.java:282)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor$2.run(Indexable.java:161)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runIndexer(RepositoryUpdater.java:298)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor.index(Indexable.java:159)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doIndex(RepositoryUpdater.java:2773)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.access$800(RepositoryUpdater.java:2177)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2659)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$1.run(RepositoryUpdater.java:2657)
   at org.netbeans.modules.parsing.impl.indexing.errors.TaskCache.refreshTransaction(TaskCache.java:565)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.index(RepositoryUpdater.java:2657)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork$4.call(RepositoryUpdater.java:5726)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork$4.call(RepositoryUpdater.java:5634)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$4.run(RepositoryUpdater.java:2150)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runInContext(RepositoryUpdater.java:2146)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runInContext(RepositoryUpdater.java:2127)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.access$1500(RepositoryUpdater.java:159)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSource(RepositoryUpdater.java:5761)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSources(RepositoryUpdater.java:5431)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$RootsWork.getDone(RepositoryUpdater.java:5050)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$InitialRootsWork.getDone(RepositoryUpdater.java:5833)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:3432)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:6195)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.access$4300(RepositoryUpdater.java:5846)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2$1.run(RepositoryUpdater.java:6111)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304)
   at org.netbeans.modules.parsing.impl.RunWhenScanFinishedSupport.performScan(RunWhenScanFinishedSupport.java:106)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6107)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task$2.call(RepositoryUpdater.java:6103)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:90)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:6103)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:514)
   at java.util.concurrent.FutureTask.run(FutureTask.java:264)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)